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Novel steel-fiber composite bar (SFCB) and engineered cementitious composite (ECC)-concrete composite beam and preparation method thereof

A continuous fiber and concrete technology, applied in the direction of joists, girders, trusses, etc., can solve the problems of poor ductility of FRP reinforced concrete beams, large crack width and deflection, insufficient durability of ordinary reinforced concrete beams, etc., so as to improve the structural durability. The effect of stability, reduced dosage, and high strength

Inactive Publication Date: 2017-11-07
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a new type of steel-continuous fiber composite bar ECC-concrete composite beam and its preparation method, making full use of the characteristics of SFCB high strength, corrosion resistance, good ductility and excellent tensile performance of ECC, aiming to solve the problem of ordinary reinforced concrete Insufficient beam durability and poor ductility, crack width and large deflection of FRP reinforced concrete beams

Method used

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  • Novel steel-fiber composite bar (SFCB) and engineered cementitious composite (ECC)-concrete composite beam and preparation method thereof
  • Novel steel-fiber composite bar (SFCB) and engineered cementitious composite (ECC)-concrete composite beam and preparation method thereof
  • Novel steel-fiber composite bar (SFCB) and engineered cementitious composite (ECC)-concrete composite beam and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] The formula of each component of the cement-based composite material ECC for engineering is: cement: silica fume: fly ash: water: quartz sand: water reducing agent = (0.2~0.4): (0.1~0.15): (0~0.3): ( 0.15~0.2):(0.2~0.3):(0~0.0015), the fiber is PVA polyvinyl alcohol fiber, and the volume content is 2.0%.

[0039] The preparation method of engineering cement-based composite material ECC: Mix cement, quartz sand, silica fume, and fly ash with a mixer at low speed for 1 min to make the mixture evenly distributed; add water and stir at low speed for 1 min; add water reducing agent and stir at high speed for 2 min, the cement mortar can be self-leveling; finally add PVA fiber and stir at high speed for 6 min until the fiber is evenly dispersed.

[0040] For a new type of steel-continuous fiber composite reinforcement ECC-concrete composite beam cast / prefabricated on site, the specific implementation steps are as follows:

[0041] (1) According to the structural construction...

Embodiment 2

[0047] For a new type of steel-continuous fiber composite reinforcement ECC-concrete composite beam cast / prefabricated on site, the specific implementation steps are as follows:

[0048] (1) Binding and placement of reinforcement cages are the same as Example 1.

[0049] (2) The cement-based composite material ECC is used for engineering to pour a specific beam section. The pouring thickness is twice the thickness of the concrete protective layer of the longitudinal tension reinforcement. It can also be calculated and determined according to the actual situation. The length is 1 / 4~1 of the beam length / 2, the beam segment width is the same as the beam. And the beam segment is symmetrical to the moment control section of the beam.

[0050] (3) Pouring ordinary concrete, vibrating molding and curing are the same as in Example 1.

[0051] All material consumption and related dimensions need to be calculated and selected according to the needs of the actual project.

[0052] Th...

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Abstract

The invention discloses a novel steel-fiber composite bar (SFCB) and engineered cementitious composite (ECC)-concrete composite beam and a preparation method thereof and belongs to the technical field of building structures. Based on an ordinary reinforced concrete structure and a fiber reinforce plastic (FRP) reinforced concrete structure, an SFCB and an ECC are introduced, the cross section of the concrete beam is designed in a layered mode, a tensile longitudinal bar is replaced by the SFCB, and part of ordinary reinforced concrete around the tensile longitudinal bar is replaced by the ECC to form the SFCB and ECC-concrete composite beam. The ordinary reinforced concrete is still adopted in a compressive area, an interface area does not need a special treatment technology, after the ECC is poured, the ordinary concrete is directly poured, the SFCB serves as a tensile longitudinal bar, and the high tensile strength and corrosion resistance of the SFCB and the excellent tensile resistance of the ECC are comprehensively used to form the novel SFCB and ECC-concrete composite beam with the high bearing capacity and good durability.

Description

technical field [0001] The invention relates to a structure and material of a building component, in particular to a novel steel-continuous fiber composite bar ECC-concrete composite beam and a preparation method thereof, belonging to the technical field of building structures. Background technique [0002] The durability of reinforced concrete structures has always been an important research topic in the field of civil engineering. The problem of steel bar corrosion in reinforced concrete structures is very prominent. Many buildings and bridges are destroyed in advance due to steel bar corrosion, resulting in huge economic losses. Although FRP bars have good corrosion resistance and material mechanical properties. However, FRP bars are linear elastic materials, and there is no yield platform similar to steel bars, so the bending failure of FRP bar concrete beams is brittle failure and poor ductility. [0003] A new type of composite material that combines the advantages o...

Claims

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Application Information

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IPC IPC(8): E04C3/20C04B28/04B28B1/52B28B1/093B28B1/29B28B23/02
CPCB28B1/0935B28B1/29B28B1/525B28B23/02C04B28/04E04C3/20C04B14/06C04B18/146C04B18/08C04B16/0641C04B2103/302C04B32/02Y02A30/30
Inventor 葛文杰季翔蔡陈
Owner YANGZHOU UNIV
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